Goodness knows how many times I've sat with clients who have at some point clearly asked their web designers to add Twitter/FB (usually those two) buttons on their sites, and then proceed to do absolutely nothing any of the social platforms - assuming that just having a profile is good because they "understand it's important"

Totally on board with only having a limited range of social profiles and making those work hard for you.

It is sometimes hard though to demonstrate pounds and pence (sorry, dollars and cents) ROI to some of these channels as I think the value is in brand awareness more than driving sales.